RIDGECREST, Calif. — Sergio Munoz was known around this small desert city to acquaintances as a personable dad, and to police for his long rap sheet.In recent weeks, he began losing the moorings that kept him stable — his job, then his family. Kicked out of the house, he stayed at a friend’s place, using and dealing heroin.Life fully unraveled when Munoz, with two hostages in his trunk, led